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704.1.2.2 Identification of Hydrogen Piping Systems
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Hydrogen piping systems shall be marked in accordance with ANSI A13.1. Markings used for piping systems shall consist of the name of the contents and shall include a direction-of-flow arrow. Markings shall be provided at all of the following locations:
- At each valve.
- At wall, floor and ceiling penetrations.
- At each change of direction.
- At intervals not exceeding 20 feet (6096 mm).
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